I am priming with a latex based PVA drywall primer (Behr Premuim from Home Depot). During the time that elapses between when I cut-in the corners with a brush and roll the fields, the joint compound in the corners seems to be softened by the primer, and chunks of it stick to the roller, pulling little "divets" out of the wall. What am I doing wrong? (Note that the joint compound has had several weeks to harden, so it should be well dried by now).
I have used the same painting technique many times in the past without problems.